Tractor.



J. COCHRAN.

TRACTOR.

APPLICATION FILED MAR. f; I915. RENEWED DEC. 3. m1.

PatentedJnne 4-, 1918.

I n u I animator J. COCHRAN.

I TRACTOR. APPLICATION FILED MAR-I; I9I5- RENEWED DEC- 3, I9I7- 1 $@8,3%% Patented June 4, 1918.

' 4 SHEETS-SHEET 2- r J. COCHRAN.

mom. APPLICATION FILED MAR. I, 1916- RENEWED DEC. 3. 19!?- 4- $HEETSSHEET 3.

Patented June 4, 1918.

J, COCHRAN.

TRAGIOR. APPLICATION man MAB. 1.. I915. RENEWED DEC- 3. 1911.

4 SHEETS-SHEET 4- A FIIIL Patented J 11116 4, 1918.

JOSEPI-ICOGHRAN, or n oithnalxrs; Louisiana. i

Application filed March 1, 1915,8eria1 m, 11,312.

oi": tractor which is usually employed for drawing plows or c'ultivators across afield and receives its propulsion from a; mor

carried by the vehicle and" means tofdraw upon or take u a cable, stretching-across the field, and aving its ends anchored.

Heretofore tractors of this type have usually y cooperated with a rope or cable whichsoo i' becomes frayed due to, the action of. the drum or winch which has a bight there l around. v y a j j a a While my invention particularly relates to tractors, it may be carried out in anyfarm implement, road scraper, or grading machine. y 1, My object is to provide a tractor having improved means for cooperation with a chain stretched across a field, on the ground, wherein provision will be made for paying out the chain evenly and regularly behind the machine as it advances and preventing any bunching or massing of the chain after it has passed through the operatingmeans; further, to provide improved meanswhereby, when the end of the stretch of chain is reached, the chain may be quickly and easily manipulated to permit reversal of the tractor; further, a general improved combination of parts and devices whereby the draft on the chain will be so appliedthat the chain will be disposed low down and relatively close to the surface of the ground and the leverage, Y applied downwardly through the machine. toward the ground, will be minimized. Heretofore in tractors of this eneral type, the draft hasbeenso arranged that the pull on the chain or cable has been the causeof a very great downward pressure being exerted through the tractor and onto the ground wheels, thus increasing the resistance to be overcome by. the enginein drawin the tractor across the field. I dispose my draftfmechanism so that the stretch of chain being ulled upon by themachine is disposed very ow. A further object is togprovidelimprove-a Renewed December 3, 1917. Serial No. 265,237.

by the chain may be paid out at one side orthe other ofthe machine, according to the" direction in which themachine traveling and subject to adjustment, if desired, the end that the idle stretch of chainr willybel laid on'the-ground outside the r fl fwheel of the machine; y

The 1 vention, compr features "and novel combinationsandadapta tions of parts and mechanisms appearing more fully hereinafter, but Iwish it undermodification. within the spirit and scope th elfiof. y .13-

the accompanyingdrawings Figure 1 is a plan view; a I F g. 2, aside elevation;

Fig. a perspective of the saying mechanism; a a a V y lFlg. A, an edgeview thereof;

y Fig. '5, aplan viewofga modification; a

wheels 2, controlled in any suitable manner and rear driving wheels 3 drivenfin any.

ises certain improved stood that the specific construction hereinafter described and disclosedifn the, draw ingsis to ,be considered asillustrative, rather thanrestrictive, ofthe sc pe of the invention; as my inventionlis susceptible, of

a diagrammatic view showinghow steering Specification of Letters Patent. Patented 11116 4, 1918. f

merits in the paying out mechanism Wheresuitable manner from any suitable motor or engine 4: and they may be provided with any suitable difi'erential.

or cable has a very short lifefin connection Having discovered that an ord nary rope with a tractor of the; type to which my i vention belongs, .my improvements contems plate the use of mechanism adapted who operate with a chain 5which may be of anyordinary kind. This chain is laid on:

the ground across the field which it, is rdesired to cultivate or to be traversed the tractor, as shown in Fig.7 ,the a ends of the chain being. provided with any suitable anchors 6. which mayfhave eyes? to receive a hook" that y e e own from the trac tor by; hand or by a crane. (notshown), for the purpose of raising the anchors and disposing them wheredes ired. The branches 8 of the chain are the loose ends thereofz' said ends. As the machine advances, it

draws upon the stretch 5 of the chain and 5 pays out the stretch 5 behind it. Both cept pwlpllpglre taken up the machine.

Mounted 1n suitable 'bearnigs 1s a trans 9)"andawo1ni wheeljl1 which is any/suitable operative connections, conby fai chltch and lever for CZLIlSll'lg. the wheels 3 to bedrlven by the motor when v the purpose 1 of converting machine a "traction; eng ne for n oving t fl0111 Q11;Q field. bljanotheror from place tofplace and;

is" not employedfor propelling the nachine TA siiitablelclevis orjd rawin device, 1a is serve the purpose satisfactorily. The stretch 5 ofthechain which is being pulled upon, comes in at the front of the machine below thefen ine 41 and at only a slight distance abovethe surface of the ground and is pref- I erably'supportedby a sheave hanger 17 and it then run s rearwardly tothe under side of the pocket sheave 10 and thence upwardly around therear half of the circumference thereof and thence forwardly and around a smooth takeofl sheave 18, and

thence to another pocket sheave 1 9,Figs.

3 and 1, ahd finally, aroundan idler sheave 55 20. carried by an arm 21 which is pivotally mounted, "as for instance, onthe shaft 22 of the sheave" 18and may be held in anyone of several positionsfto which it ma be swung to disposelthe paid out stretchfi nearer to or fartherfroin the frame 1. 1 Any suitable means may be employed to hold the I arm 21 in any one of its adjiist ed positions. A trough 23is carried by the arm 21 and assists in laying the chain on the ground. The shafts 9 and 22 are provided with verse shaft 9 which carries a pocket sheave.

r venfby swarm 12 on the engine shaft 1 3 ,;thus affording the means for; drawing, uponah cha n. The engine 4E may have. p p p 1 a 1 very ser ous defect in 13121 10115 machines abrqsga field. w ielil c tiva i s sang 11- cennected to the machine for the attach any suitable gearing 24 for driving the shaft- 2-2; fro nthe-shaft, 9 and the pocket sheave 19 1s driven from shaft 22 by gears 9254; 3 The gearing is so proportioned that the sheaves 10, 18 and 19 all revolve at the samespeed; Modifications of thisqdriving means could be resorted to. The use of the pocket I sheave 1'9 in conjunction with the pocket sheave l0 insures the accurate taking. oif or. paying out of the chain after it passes flOIh the draft pocket sheave 10 and consequentlygthereis. none of the buncl fuup or inassinguphol the chain such ashas been shown in Fig. 1 only the sheave 18, the other parts being omitted}The sheave is driven and cooperates with the chain inthe man ner previously set forthandtheparts, such as 24:, 25, 19, 21,20, and 2 3 fare duplicated. The engine shaft being jb'elowjthe sheaveIS. last mentioned, when -.the tractor is return ingl'asfroin leftto right, for instance, Fig. 7 the chain c 5" is then takenjofi-o'f the sheave 18 and displaced from the position shown in Fig; 1 andjtransferred to the other'sheave 18 and to the mechanism at the other'side of the machine corresponding to the nechanisin 0f l[l1g$ 3 ahd 4, butthe chain is still drawnfiupon" by the samepocket sheave10.[' QI Referring to Fig; 5, showing a modifies tion of the paying out nechanism, thechain 5, after leaving the pocket sheave 10 passes around a pocketsheave26 which positively takes it off the pocket sheave 10, and then passes to an idler sheave 27 carried by. a Ilat erally slidable frame 28. havingja trough 29 down which the chain passes. The other end offthe fra111e28 carries duplicates of the sheave 2.? and trough 29. The frame has a slot 30 through which the shafts. of the takeoffsheaves pass. As inFig. 1,.34 duplicate' take-0E sheave 2.6.is provided so that the chain can be engaged with either one of the sheaves 26 and either one of the sheaves 27; The shaft 9 drives thefshafts of thesheave 26 in unison with said shaft ;.9 sothat the chain is taken oh" by a sheave 26 at exactly thespeed it is passing around the 120 draftsheave 10. a y y In Fig. 8, have shown how the sheave 26 may be mountedloose on itsshaft 31 and connectedthenetoby a spring 82so that it can have a slight rotation onwsaid shaft when freed therefrom; The sheave is positively y gnnectedtothe shaft, for driving purposes, by opposite ratchet wheels 33 and 3 41and a double pawl composed of the pawls 35 and 36 independently mounted on pivot 130 37 and connected by spring 38 which tends to throw them into engagement with the ratchet wheels 33 and 3st. The ratchet wheels are carried by the shaft 31 and the pawls by the pocket sheave 26. By pressing together the outer ends of the pawls they are released from the ratchet wheels, whereupon the sheave 26 is only connected to the shaft 31 by the spring 32 which permits of slightly turning the sheave 26 by hand to position it so that the stretch of chain between it and the sheave 10 will be tightened. The construction in question is simply employed for purpose of taking up any slack in the chain intervening between sheaves 10 and 26.

In the claims, in referring to a pocket sheave, either as a draft sheave or a takeoff sheave, or the combination of two such sheaves, I intend to cover a sheave having pockets and intervening channels adapted to receive the links of the draft chain substantially as shown in Figs. 8 and 9, subject to such variations as fall within the scope of such a sheave, as distinguished from a mere sprocket wheel having projecting teeth adapted to enter the links of the chain.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is y 1. In a tractor, draft mechanism comprising a chain, a draft pocket sheave having pockets and intervening channels, and a take-off sheave, said sheaves cooperating with the chain, and means for driving the said sheaves at the same speed.

2. In a tractor, draft mechanism comprising a chain, a draft pocket sheave having pockets and intervening channels, and a take-off pocket sheave having pockets and intervening channels, said sheaves cooperating with the chain, and means for driving the said sheaves at the same speed.

3. In a tractor, draft mechanism comprising a chain, a draft pocket sheave having pockets and intervening channels, and independent take-off pocket sheaves each having pockets and intervening channels, said takesage of the chain thereover according to which of the take-off sheaves is employed.

4. In a tractor, draftmechanism comprising a chain, and a draft pocket sheave cooperating therewith, said sheave having pockets and intervening channels.

5. In a tractor, draft mechanism comprising a chain, a draft pocket sheave having pockets and intervening channels, and a pocket take-off sheave having pockets and interveningchannels whose axis is disposed at an angle to the axis of the draft sheave, and means for driving the said sheaves at the same speed, said sheaves cooperating with the chain.

6. In a tractor, draft mechanism comprising a chain, a draft pocket sheave havingpockets and intervening channels, and take off means for the chain comprising a sheave mounted to be moved inwardly or out- Wardly to different positions of lateral adjustment in relation to the tractor and draft pocket sheave for the purpose of laying the chain at different points in relation thereto.

In testimony whereof, I hereunto afiix my signature in presence of two witnesses.

JOSEPH COGHRAN. Witnesses:

S. V. LOCKWOOD, C. A. NEALE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

